OM-D won't wake from sleep.

I've searched for other threads, and found some slightly similar, but they were generally lockup that required the battery to be removed.

I have an OM-D with the latest 1.5 firmware (had same problem with 1.1? 1.2?) and I use the Pany 14 and 20 and Oly 45mm. I leave the EVF selection to manual and use the EVF almost exclusively for shooting. I have the sleep time set to 1 minute.

When the camera goes to sleep, most the time (80%?) it will not wake from sleep with a half-press of the shutter, but occasionally it will. Pushing any other buttons won't wake it either, but cycling the power switch brings it back.

Either. Once I'm trying to wake up the camera I've tried half-press, full-press, and every button and dial I can find. The only thing that wakes it up is flipping the power switch off and back on. On the occasion it does wake from sleep as expected it does so with just a half press of the shutter, just like my Nikons.

just as I was going to change the sleep setting to 5 minutes, I realized there are separate settings for "Sleep" and "Auto Power Off". I had sleep set to 1 min and auto power off set to 5 min. I've never seen that on any other camera, usually there's just a Sleep option, which essentially powers off, but can wake with a half-press.